矩形盒基于不同板坯形状的拉深模拟及回弹应变分析

利用双相钢DP600对矩形盒进行矩形板坯和切角板坯的拉深模拟,指出,应变状态及断裂方式随着板坯形状改变而改变。经分析比较发现,矩形板坯在侧壁上极易产生回弹变形,而切角板坯在侧壁上基本不发生回弹,故切角板坯能获得更大成形深度的同时还具有更好的形状稳定性。     

用板料拉深成形加工白金戒指的工艺研究

介绍了一种白金戒指（线戒）的成形加工新方法．先将铂金板料技课成具有戒指内径和壁厚的圆筒，然后按一定宽度切割圆筒来获得戒指毛坯．确定了工艺中的相应数据，计算了有关工艺参数．讨论了模具的组成结构，研究设计了对圆筒的切割方法．     

镁合金的应用及其塑性成形技术

文章介绍了镁及镁合金的特点,总结了镁合金在汽车、自行车、航空航天、3c产品、武器等方面的应用,阐述了镁合金塑性加工技术的现状,提出了塑性成形是镁合金产品成形的发展方向.     

钛及钛合金板材拉深成形的影响因素与技术进步

钛及钛合金相对铝、钢等金属材料塑性差、极限变形量小、成形时回弹大,拉深成形相对困难。介绍了钛及钛合金拉深成形的影响因素及其对成形的影响,综述了钛及钛合金拉深成形在各向异性控制、压边力控制、计算机模拟以及加热方法等方面的技术进步,指出了未来研究人员应充分利用计算机模拟技术,对影响钛及钛合金冲压成形的各种因素及其之间的相互关联建立详尽的数据库,以便该成形工艺在钛及钛合金零部件的成形得到更广泛的应用。     

钢铁材料半固态坯料制备与成形的研究现状与展望

半固态成形技术是冶金材料领域重要研究课题。本文总结了半固态钢铁等高熔点材料制备与成形技术中的组织演变、坯料制备和成形工艺等方面理论与应用研究成果，对其发展现状与趋势进行了分析与讨论，并指出钢铁等高熔点材料半固态成形技术广阔的应用前景。     

镁合金铸造成形的工艺进展

分析目前国内外镁合金铸造成形的现状和进展，介绍了镁合金铸造成形工艺特点及新技术。     

高成形镁合金板材最新研究进展

镁合金作为当前应用广泛的轻量化金属结构材料,具有高比强度和比刚度、优良的阻尼性能以及可回收等优点。同时,中国拥有丰富的镁资源,其应用与推广可起到缓解中国铁、铝矿等传统金属材料的短缺问题和降低污染的作用。变形镁合金在航空航天、交通运输和生物医用支架等领域受到广泛青睐。但是,大部分变形镁合金具有密排六方（hcp）晶体结构,室温下能够开动的独立滑移系较少,因而在塑性变形时易形成强基面织构导致其室温塑性成形能力差。如何提高镁合金板材的室温成形性能是扩大镁合金应用当前亟待解决的主要问题之一。综述了近年来国内外研究学者在改善镁合金板材室温成形性的工作及研究进展,主要集中在添加合金元素和塑性预变形调控来消融强织构与低成形壁垒,阐述了添加稀土元素、微合金化、新型轧制及挤压加工、预变形塑性加工等手段对镁合金板材微观组织结构、晶体取向及成形性能的调控规律,为制备高成形性镁合金板材制备提供参考。     

喷射成形镁合金的研究进展

喷射成形技术经过几十年的发展,已经广泛地应用于研制和开发各种高性能材料,将其应用于镁合金的研究开发,使镁合金的性能得到了很大的提高,拓宽了镁合金的应用.文中从喷射成形工艺的角度对镁合金的研究进行了综述,简述了喷射成形镁合金的特点,着重介绍了喷射成形镁合金的研究进展,并提出了研究中存在的一些问题及展望.     

Nd对喷射成形Mg-9Al-3Zn-6.5Ca-0.6Mn镁合金组织及力学性能的影响

利用光学显微镜(OM)、扫描电镜(SEM & EDS)和X-ray衍射分析仪等研究了Nd对喷射成形Mg-9Al-3Zn-6.5Ca-0.6 Mn镁合金组织及力学性能的影响.喷射沉积坯晶粒细小,以α-Mg、Al2Ca和Ca2Mg6Zn3为主要物相.挤压后以α-Mg、Al2Ca和MgZn2为主要物相.加入Nd主要形成Al3Nd相,新相成片状;当Nd含量为2%时,挤压态合金的力学性能最佳,伸长率无明显变化,拉伸断口基本上为断裂,有少量的韧窝.     

Influence of Variable Blank Holding Pressure on Impeller Sheets in Deep Drawing Process

In this research paper, a three dimensional elasto-plastic finite element (FE) model for mild steel material as blank has been developed to study the behavior of wrinkling on the impeller flange surface and parameters of deep drawing under different blank-holder pressure from 2.5 to 7.6 MPa. For modeling and simulation, commercially available FE software ANSYS 14.0 has been used. In industry, an experimental setup was built accordingly with a half cone angle of 36°. Experiments were carried out on a hydraulic press machine. The experimental results were compared with numerical results.     

薄板压延中在压边圈叠加振动的模拟试验

应用模拟的方法在薄带摩擦试验中于正压力上叠加低频振动,模拟薄板在叠加振动的压边圈下的摩擦状态,系统地研究了振幅、频率、正压力、拉速、表面与摩擦力的关系.试验表明,在一定的条件下,低频振动叠加是可以改善薄板成形变形区的摩擦状况,降低摩擦力的.     

Hydro‐mechanical Deep Drawing of Rolled Magnesium Sheets

Magnesium sheets offer high specific properties which make them very attractive in modern light weight constructions. The main obstacles for a wider usage are their high production costs, the poor corrosion properties and the limited ductility. Until today, forming processes have to be conducted at temperatures well above T = 220 °C. In the first place, this is a cost factor. Moreover, technical aspects, such as grain growth or the limited use of lubrication speak against high temperatures. The first aim of the presented research work is to increase the ductility at lower temperatures by alloy modification and by an adapted rolling technology. The key factor to reach isotropic mechanical properties and increased limit drawing ratios in deep drawing tools, is to achieve fine, homogeneous microstructures. This can be done by cross rolling at moderate temperatures. The heat treatment has to be adapted accordingly. In a second stage, hydro‐mechanical deep drawing experiments were carried out at elevated temperature. The results show that the forming behaviour of the tested Mg‐alloys is considerably improved compared to conventional deep drawing.     

Experimental Investigation on Hydromechanical Deep Drawing of Aluminum Alloy with Heated Media

Temperature controlled sheet hydroforming is known as the innovative processing of warm/hot sheet hydroforming. Cylindrical cup hydromechanical deep drawing (HMD) at elevated temperature is the typical process for basic research. Warm HMD process was carried out on a warm sheet hydroforming experiment platform to investigate the influences of key processing parameters on formability. The process window of successful forming versus liquid pressure was obtained, which was manifested as a shape of pyramid. The region of successful forming in warm/hot sheet hydroming is a father set of that in cold sheet hydroforming. The microstructure evolution of cups formed by using warm HMD under the effect of temperature was investigated. The grain growth was observed compared with cold HMD. The hardness of hydroformed cup was tested and no apparent reduction of hardness was detected.     

Influence of Cerium on Corrosion of AZ91 Magnesium Alloy

Effect of cerium addition on corrosion resistance of AZ91 magnesium alloy was investigated using the static weight loss and polarization curve method as well as metallographical observation. The results indicate that a small amount of cerium （0.2% - 0.8%） in AZ91 magnesium alloy can significantly reduce the corrosion rate, enhance the electrode voltage and lower corrosion current density in 3.5%NaCl aqueous solution, and AZ91-0.8% Ce alloy has better corrosion resistant performance. The reason for increasing corrosion resistance is attributed to the addition of Ce, refining the α-Mg grain, reducing the segregation of element Al, and improving the morphologies of β-Mg17 Al12 phases.     

Influence of Texture on Mechanical Behavior of Friction-Stir-Processed Magnesium Alloy

Friction stir processing (FSP) improves the mechanical properties of metallic materials. In this study, a magnesium alloy AZ31B was friction stir processed by using single and multiple pass. The friction-stir-processed magnesium alloy exhibits higher tensile strength and ductility in the transverse direction (TD) compared to the longitudinal direction (LD). Both single pass and multiple (two) pass friction-stir-processed material show similar anisotropy in tensile properties, but the multiple pass friction-stir-processed material shows fine-grained microstructure with higher tensile strength and ductility. The tensile anisotropy in the friction-stir-processed AZ31B originated from the textured microstructure that evolved during FSP.     

铸轧3003深冲料用铝合金退火工艺研究

采用光学显微镜(OM)和拉伸试验机对铸轧法生产的3003铝合金深冲料成品退火工艺的显微组织和力学性能进行了研究,结果表明,两种工艺方案下生产的3003铝合金沿轧制方向0°的力学性能优于沿轧制方向90°,此差异性随退火温度升高而逐渐减小并趋于一致.铝合金样品经退火处理后的强度急剧降低,变化最大的温度区间处于280～300...     

铝含量对GCr15钢带织构和深冲性能的影响

在杭钢集团大生产的条件下,分析了不同铝含量对退火后GCr15钢带的织构、金相组织、晶粒取向、硬化指数n和塑性应变比r以及凸耳指数Δr的影响。试验结果表明:在[Al]s的质量分数为0.017%~0.027%时,铝对高碳的GCr15钢带的深冲成型性能影响规律与铝对低碳钢板基本一致,随着钢中铝含量的升高,r值升高,且{111}面有利织构含量增加,但相同铝含量下GCr15钢的r值比低碳钢却要小很多,n值则相差不大,Δr指数比低碳钢更小,晶粒取向也有明显的区别,说明高碳的GCr15钢各向性能比较均匀,能满足一般用途的深冲成型要求。     

温变形对AZ31镁合金组织的影响

对铸态AZ31 镁合金在210℃温变形时的组织演变和力学性能进行分析,为进一步开发镁合金的成形工艺提供实验依据.     

Zn-Cu合金深冲性能与工艺参数间的函数关系

采用回归分析方法研究了Zn-Cu合金深冲性能与工艺参数间的函数关系。